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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f9f07d06717bed04f8eae7aac5a66cadd488e04048256a798b97eb0c458c8c6' 
  AND token = '/5FNKgBCTNN67TAkMNscY4D6bdZV+xbKbN3jghw6KAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}